Can't say I have, nor would I personally I just dislike the idea of software controlled overclocking from the OS.
ROG Connect is NOT just software overclocking from within the OS. It's a combination of a software interface running on a completely differnt machine, and on-board hardware, that allows real-time adjustments to clocks and voltages from that other PC, external to the board that has the ROG Connect hardware.
Because the ROG Connect software interfaces directly with the board's hardware, both monitoring and actual voltage changes are far more consistent, and as well, they can be done when the ROG Connect board itself is powered down.
Yes, you read that right, voltage adjustments and temperature monitor works even if the ROG Connect board is powered down...great for benching under extreme cooling, when you might need to be below a certain temperature before booting the ROG Connect board. Watch the temps drop, click the power button, and then you can watch the POST reader to see when and what causes a failed boot...
I must digress though, that it's usefulness is pretty much exclusively to benchers, and not for 24-7 users.